Halward



F. HALWARD 2,956,321

UNIT an: CAST nms 4 Sheets-Sheet 1 Filed Aug. 4. 1958 INVENTOR.

Fa 5 Mama/9,90

Irma/7 Oct. 18, 1960 F. HALWARD UNIT pm cm was 4 Sheets-Sheet 2 FiledAug. 4. 1958 IN V EN TOR.

4r TORl/EY Oct. 18, 1960 F. HALWARD 2,956,321

- UNIT DIE CAST DIES Filed Aug. 4, 1958 4 Sheets-Sheet 3 1N VEN TOR.

F0 Lin? 6094 we mo BY $444M.

Oct. 18, 1960 F. HALWARD 2,956,321

UNIT DIE CAST DIES Filed Aug. 4, 1958 4 Sheets-Sheet 4 7 INVENTOR foureHm. wnno BY K W ATTORNEY United States Patent UNIT DIE CAST DIES FolkeHalward, Southfield Township, Mich., assignor to Detroit MoldEngineering Company, Detroit, Mich., a corporation of Michigan FiledAug. 4, 1958, Ser. No. 752,908

12 Claims. (Cl. 22-68) This invention relates to die casting machinesand more particularly to the construction and mounting therein of unitdie cast dies.

It is the object of the present invention to provide in combination witha die cast machine, an ejector housing adapted for securing to thereciprocal platen of said die cast machine and incorporating therein amaster ejector plate. In conjunction therewith and projected intolaterally opening side portions of the ejector housing and masterejector plate there is removably positioned a pair of independent unitdie cast dies.

It is the object of the present invention to provide a novel ejectorhousing with master ejector plate together with means for removableassembly and interconnecting therewith a pair of interchangeable unitdie cast dies.

It is another object herein to provide a novel ejector housing having aseries of bores to slidably receive a series of reciprocal rackstogether with interconnected rotatable pinions in driving relation withsaid racks for simultaneous reciprocal movement thereof.

It is a further object to provide a novel unit die cast die whichconsists of a cavity retainer plate, an ejector plate carrying ejectorsleeves projecting into said cavity plate, an anchor plate adapted forinterlocking with the ejector housing, together with cores respectivelysecured to the anchor plate and projecting through the ejector plate andinto the cavities in said cavity plate.

It is a further object to provide in said unit die cast die, aprefabricated cavity plate with the cavities arranged for a particulardie cast operation, and with the ejector plate, ejector sleeves, anchorplate and associated cores previously assembled as a unit adapted forprojection into the lateral opening of the ejector housing, with saidanchor plate interlockingly engageable with and secured to the ejectorhousing, and with the ejector plate secured to said master ejector platefor movement therewith, and with the respective cavity plate adapted forsecuring fixedly to the ejector housing.

It is another object to provide a novel form of clamp structure forremovably anchoring the assembled uni-t die cast die and particularlythe cavity retainer plate with respect to the ejector housing.

It is a further object to provide a center block on the master ejectorplate adapted to interlockingly receive the respective ejector platesfrom the individual oppositely arranged unit die cast dies.

It is a further object to provide an upright center block within theejector housing adapted to interlockingly receive inner end portions ofthe respective cavity retainer plates of the individual unit die castdies.

It is still another object to provide in conjunction with the anchorplate mountable upon the stationary platen of a die cast machine, anupright center block adapted to interlockingly receive and secure theinner ends respectively of the individual cavity retainer plates of theoppositely arranged unit die cast dies.

This construction also includes suitable clamping means forsecuring therespective outer ends of said cavity retainer plates to outer portionsof the stationary anchor plate. 7

These and other objects will be seen from the following specificationand claims in conjunction with the appended drawings in which:

Fig. 1 is a fragmentary partially broken away and sectioned sideelevational view of the ejector housing and assembled unit die cast dieand associated stationary cavity plate.

Fig. 2 is a fragmentary plan view thereof.

Fig. 3 is another fragmentary plan view thereof partly broken away andsectioned, but showing the complete assembly of the stationary anchorplate.

Fig. 4 is an end elevational view of the structure shown in Fig. 3.

Fig. 5 is a schematic diagram illustrating the mounting of the presentejector housing and unit die cast dies, and stationary cavity plate withrespect to the movable and stationary platens of a die cast machine.

Fig. 6 corresponds to Fig. 3, being a fragmentary horizontal sectiontaken on line 66 of Fig. 1, with one replacement unit partially removed.

Fig. 7 is a vertical section taken on line 77 of Fig. 1, illustratingthe shape of the master ejector plate.

It will be understood that the above drawings illustrate merely apreferred embodiment of the invention, and that other embodiments arecontemplated within the scope of the claims hereafter set forth.

Referring to the drawings, Fig. 5 diagrammatically illustrates theenvironment of use of the present invention wherein the movable platenof a die cast machine is indicated at A and the stationary platen at B.An ejector housing 11 is suitably secured to platen A, including cavityplate 31, whereas anchor plate 65 is suitably secured to stationaryplaten B and carries stationary cavity plate 63.

A suitable linkage C and D is pivotally connected at E to stationaryplaten B and its opposite end is joined at 17 to one of the rotatablepinions which operates automatically the master ejector plate hereafterdescribed depending upon the relative motion of platen A with respect toplaten B.

The present ejector housing 11, shown in Fig. 1, includes the laterallyelongated top plate 12 and spaced therebelow the bottom plate 13, therebeing an intermediate solid body 15 secured therebetween as by weldingor by bolts.

Each of plates 12 and 13 has in its outer surface the transverselyextending notches 14 providing means for securing ejector housing 11 tothe reciprocal platen A of the die cast machine diagrammatically shownin Fig. 5.

Body 15 has a pair of transverse vertically spaced bores formedtherethrough adapted to rotatably journal and support the pair ofvertically spaced elongated pinions 16 which extend through said ejectorhousing.

The outer end of top pinion 16 is formed at 17 of square shape tofacilitate its connection with operating link D shown in Fig. 5 by whichrotative motion is delivered to pinion 16 and the corresponding lowerpinion through the intermeshing spur gears 18 respectively secured uponpinions 16 within corresponding recesses in body 15.

Said body has a top and bottom transverse series of longitudinallyextending bores arranged respectively above and below the upper andlower bores in said body which receive pinions 16.

The respective upper and lower series of bores slidably receive thereinthe elongated racks 19 portions of which intermesh with pinions 16 indriven relation whereby rotary movement of pinions 16 will effectcorresponding reciprocal movements in unison of all of the racks 19. IAs shown in Fig. 2 said racks at their inner ends terminate in thereduced axial extensions 20 which project into and are fixedly securedto upright master ejector plate 21 which is movably nested withinhousing 11 between plates 12 and 13. Said master ejector plate is ofrecumbent'H-shape so as to define upon its opposite sides the outwardlyopening recesses 22, Fig. 1 in conjunction with the correspondingoutwardly opening recesses on opposite sides of housing 11. V I

These outwardly opening recesses as hereafter described are adapted toremovably receive the respective unit die cast dies as an assembledunit. Each of the unit die cast dies includes elements 31, 28, 27, 30,41, 40, 35, 36, 37 and 39, Fig. l, to be described in detail. These unitdie cast dies are projected into the outwardly opening opposite sides ofthe ejector housing.

Upright outer outer end portions of master ejector plate 21 are cut awayto provide the lateral extensions 23 of reduced thickness by which theindividual ejector plate 27 in each of the unit die cast dies may besecured to said master ejector plate, employing bolts 29, Fig. 1.

Upright center block 24 is located at the center of master ejector plate21 and secured thereto by screws 25, Fig. 3, and includes the lateralprojections 26 adapted to interlockingly receive the correspondingupright inner edge of the respective ejector plate 27 in the individualunit die cast die. This provides an effective means of securing theindividual ejector plates to the master ejector plate for movementtherewith. Ejector plate 27 includes ejector sleeve securing plate 28fixedly mounted thereon adapted to anchor the horizontally disposedejector sleeves 30, one of which is shown for illustration. Normallythere would be a number of said sleeves corresponding to the number ofcavities in cavity plate 31, into which said sleeves slidably project.

The unit die cast die also includes the upright rectangularly shapedcavity retainer plate 31 which has preformed therein a series ofcavities 58 adapted for registry with corresponding cavities 64 formedin the stationary cavity plate 63 thereafter described. These cavitiesdefine the finished die cast article 59, a portion of which extendsacross the parting line 57 between cavity plates 31-63.

Mounted upon the interior upright wall of body 15 upon opposite sidesthereof are the laterally spaced anchor plates 32 secured as at 33. Eachplate 32 has undercut retaining shoulders 34 adapted to slidably andinterlockingly receive projections 33 of end plates 37 secured at 39 tothe core anchor plate 35 of one of the unit die ing to the stationaryplaten B of the die cast machine,

cast dies.

Said anchor plate has secured thereto core anchor plate 36 which retainsbetween plates 35- 36 the heads 40 of a series of elongated cores 41,one of which is shown. Each core slidably projects through acorresponding aperture in ejector plate 27 and through the bore of anejector sleeve 30 and into cavities 5864 to define the internal bore ofthe molded article 59.

Accordingly the elements 31, 28, 27, 36, 35, and 37 as well as thesleeves 3t) and -cores 41 all form a part of the unit die cast die whichis projected into one of the lateral openings of the ejector housing 11between plates 12 and 13. In this connection, it is noted that theanchor plate assembly 35, 36, and 37 interlockingly engages plate 32 asthe unit die cast die is movably projected into the ejector housing.

Instead of ejector sleeves 3i) and cores 41, conventional ejector pins,may be employed as an equivalent assembly. When in its final assembledposition, the unit die cast die is fixedly secured therein by securingthe individual ejector plate 27 at its top and bottom to the outerextensions 23 of the master ejector plate 21 using bolts 29.

As shown in Figs. 2-3 there is provided another upright center block 42intermediate the sides of the ejector housing and suitably secured totop and bottom plates 12 and 13. Opposite upright sides of block 42 havelateral projections 43 adapted to interlockingly project with- 4 incorresponding upright notches 45 formed in the inner upright edge of therespective cavity plate 31.

Dowel pins 44 are anchored within and project outwardly from centerblock 42 and upon assembly of the unit die cast dies retainingly andcooperatively project within preformed laterally opening apertures 46within the end faces of cavity plates 31.

In the preferred embodiment said dowel pins at their projecting endsarediarnond shaped for cooperative positioning within circular apertures'46 in said cavity plates. This interlock between center block 42 andthe respective cavity plates 31 occurs as the unit :die cast ,dies areassembled into the ejector housing.

The assembly is further completed 'by employing upon each side of theejector housing a pair of vertically spaced clamps 49 whose bifurcatedends 50 are tapered upon their inner surfaces for cooperative retainingengagement with the respective tapered undercut surfaces 47 and ,48formed within ejector housing 11 and cavity plate 31.

Said clamps are secured in the assembled position shown in Figs. 2 and 3by the bolts 51 threaded into the ejector housing and through theoversized openings 53 in clamp blocks 49. These openings are larger thanthe respective socket heads 52 .of bolts 51 to permit quick disassemblyof clamp block 49 upon release of latch 54. Said latch is pivotallymounted at 55 on clamp block 49 and includes the arcuate slot 56, whichcooperatively receives bolt 51 between its head and the end face ofblock 49.

The clamp is secured by tightening bolt 52. Slight loosening of bolt 52permits disengagement of clamp 54, permitting disassembly of clamp block49.

As shown in Fig. 2, cavity plate 31 has horizontally extending aperturestherethrough enlarged atparting line 57 to receive bushings 61.Corresponding guide pins 62 are secured to and project outwardly fromstationary cavity plate 63 for sliding registry within bushings 61 andbores 60 to guarantee proper alignment of cavity plates 31 and 63 whenthey are brought together in the die casting machine, Fig. 5.

The above stationary cavity retainer plate 63 has preformed therein inaccordance with a particular die casting operation cavities 64, Figs. 1and 3, one of which is shown, adapted for cooperative registry with thecorresponding cavities58 in reciprocal cavity plate 31. Cavity plate 63is mounted upon one side of anchor plate and secured thereto. Plate 65has across its top and bottom surfaces elongated slots 67 providing ameans of anchor- Fig. 5.

An upright-center block 66 is secured upon the inter1or surface of plate65 by bolts 69, Figs. 3 and 4 and has 1 upon its opposite sides theupright lateral projections 43 adapted to interlockingly project intocorresponding upright grooves 45 in the upright inner edges of theremovitble and interchangeable cavity plates 63, shown in Figs.

and 3.

The outer upright edges of the respective cavity plates 63 are similarlyclamped to corresponding outer edge portions of anchor plate 65 in thesame manner and bythe same type of clamp 49 above described with respectto Figs. 1 and 3. Here also dowel pins 44 are secured to center block 66and project laterally thereof as in Fig. 3 and extend into apertures 46within the interior upright walls of cavity plates 63 completing theassembly of said cavity plates with respect to anchor plate 65.

As shown'in Fig. 1, the return pins 68 are anchored at their ends to theejector plate assembly 27 and 28. The outer ends of said pinsoperatively engage the inner surface of cavity plate 63 for returningsaid ejector plates 27 to inoperative position shown in Fig. 2 when thecavity plates .31 and 63 are brought together at parting line 57.

Referring to Fig. 3, pins 71 are secured to center block 66 and projectoutwardly thereof for cooperative engagement within bushings 70 withincenter block 42.

Anchor plate 65 in a conventional manner has a formed aperture in itsfront wall adapted to receive the die cast machine nozzle 72 whichdelivers molten die cast material through passage 73 into the centraltapered bore of sprue bushing 74. Said bushing extends through centerblock 66 and cooperatively and loosely receives the tapered spruespreader 76 defining the annular diverging passageway 75 therebetween bywhich molten die cast material is delivered to the conventional gates 78for projection into the respective cavities 64 and 58 within the meetingsurfaces of cavity plates 31 and 63 in a conventional and well-knownmanner. The inner end of sprue spreader 76 is nested within acorresponding opening in center block 42 and secured thereby fastener77.

Having described my invention, reference should now be had to thefollowing claims.

" I claim:

"1. In combination, an ejector housing with opposing sides and adaptedfor securing to the reciprocal platen of a die cast machine andincluding spaced top and bottom plates and an intermediate body having aseries of horizontal bores, longitudinally reciprocal racks in saidbores, movable means connecting said racks for movement in unison, anupright master ejector plate with opposing ends and of recumbent H shapein said housing secured to said racks, opposite ends of said masterejector plate and opposite sides of said housing opening laterally, anupright center block secured to said housing intermediate its oppositesides, and a pair of unit die cast dies respectively projected laterallyinto the openings on opposite ends of said master ejector plate andsides of said housing, each unit die cast die comprising an uprightcavity plate with inner and outer ends and having preformed cavitiestherein, said cavity plate interlocked with and secured at its inner endto said center block, clamping means securing the outer end of saidcavity plate with said housing, an upright reciprocal secondary ejectorplate rearwardly of said cavity plate and fixedly secured to said masterejector plate, ejector means secured to said secondary ejector plateslidably positioned through said cavity plate in registry with saidcavities respectively, an upright core anchor plate nested looselywithin said master ejector plate and secured to said housing, and aseries of cores secured at their one ends to said anhcor plate withtheir other ends projecting loosely through said secondary ejector plateand cavity plate and into said cavities respectively.

2. In the combination of claim 1, said cavity plate, secondary ejectorplate, ejector means, cores and core anchor plate defining a unit diecast die, said unit die cast dies being laterally inserted into saidejector housing from opposite sides, with said core anchor platesinterlocked with the body of said housing.

3. In the combination of claim 1, there being an upper and lower seriesof racks, said movable means connecting said racks consisting of a pairof vertically spaced elongated pinions journaled through said housingbody, the upper pinion meshing respectively with the upper series ofracks, the lower pinion meshing respectively with the lower series ofracks, intermeshing gears spectively secured on each of said pinions,and means for intermittently and rotatably actuating one of saidpinions.

4. In combination, a hollow ejector housing with opposing sides andadapted for securing to the reciprocal platen of a die cast machine, anupright master ejector plate with opposing ends and of recumbent H shapewithin said housing, means in said housing for longitudinallyreciprocating said master ejector plate, the opposite ends of saidmaster ejector plate and opposite sides of said housing openinglaterally, an upright center block secured to said housing intermediateits opposite sides, and a pair of unit die cast dies respectivelyprojected laterally into the openings on opposite ends of said masterejector plate and sides of said housing, each unit die cast diecomprising an upright cavity plate with inner and outer ends and havingpreformed cavities therein, said cavity plate interlocked with andsecured at its inner end to said center block, clamping means securingthe outer end of said cavity plate with said housing, an uprightreciprocal secondary ejector plate rearwardly of said cavity plate andfixedly secured to said master ejector plate, ejector means secured tosaid Secondary ejector plate slidably positioned through said cavityplate in registry with said cavities respectively, an upright coreanchor plate nested loosely within said master ejector plate and securedto said housing, and a series of cores secured at their one ends to saidanchor plate with the other ends projecting loosely through saidsecondary ejector plate and cavity plate and into said cavitiesrespectively.

5. In the combination of claim 4, said cavity plate, ejector plate,ejector means, cores and core anchor plates defining a unit die castdie, said unit die cast dies being secondary laterally inserted intosaid ejector housing from opposite sides, said core anchor platesinterlocked with the body of said housing.

6. In combination, a hollow ejector housing with opposing sides adaptedfor securing to the reciprocal platen of a die cast machine, an uprightmaster ejector plate within said housing, means in said housing forlongitudinally reciprocating said master ejector plate, the oppositesides of said housing opening laterally, an upright center block securedto said housing intermediate its opposite sides, and a pair of unit diecast dies respectively projected laterally into the openings on oppositeside of said housing, each unit die cast comprising an upright cavityplate with inner and outer ends and having preformed cavities therein,said cavity plate interlocked with and secured at its inner end to saidcenter block, clamping means securing the outer end of said cavity platewith said housing, an upright reciprocal secondary ejector platerearwardly of said cavity plate and fixedly secured to said masterejector plate, and ejector means secured to said secondary ejector plateslidably positioned through said cavity plate in registry with saidcavities respectively.

7. In the combination of claim 6, said auxiliary ejector plates havinginner upright edges, an upright center block secured to said masterejector plate and having opposite sides, the inner upright edge of thesecondary ejector plate in each of said unit die cast diesinterlockingly engaging said latter center block on its opposite sides.

8. In the combination of claim 6, the interlock between said housingcenter block and the cavity plates of said unit die cast dies consistingof cooperating slots and projections, and outwardly extending dowel pinson said latter center block projecting into said cavity plates.

9. In the combination of claim 6, there being tapered recesses in saidhousing and cavity plates, said clamping means consisting of bifurcatedblocks secured at the top and bottom of said housing on its oppositesides and having tapered ends respectively projecting into thecorrespondingly tapered recesses in said housing and cavity plates.

10. In the combination of claim 6, there being tapered recesses in saidhousing and cavity plates, said clamping means consisting of bifurcatedblocks secured at the top and bottom of said housing on its oppositesides and having tapered ends respectively projecting into thecorrespondingly tapered recesses in said housing and cavity plates, thesecuring of each block consisting of a bolt extending through anoversize opening therein and threaded into said housing, and a latchplate pivoted :7 upon said block, and having a locking groove registenable with said bolt between the bolt head and said block, release ofsaid latch plate permitting withdrawal of said block over said bolt.-

11. In the combination of claim 6, an upright anchor plate with outerends adapted ,for securing to the fixed platen of a die cast machine, anupright center block securedto said anchor plate, a pair of transverselyaligned cavity plates in longitudinal registry respectively With thecavity plates of each unit die cast die, and having inner and outerends, with their inner ends interlocked With said latter center block,and clamping means securing the outer ends of said latter cavity platesrespectively with the outer ends of said anchor plate, said lattercavity plates having preformed cavities therein registerablerespectively with preformed cavities in the cavity plates of said unitdie cast dies.

12. In the combination of claim 6, an upright anchor plate with outerends adapted for securing to the fixed platen of a die cast machine, anupright center block secured to said anchorplate, a pair of transverselyaligned cavity plates in longitudinal.registryrespeetively .with thecavity plates of each unit die cast die and having inner and outer ends,with their inner ends interlocked with said latter center block,andclamping means securing the outer ends of said latter cavityplateslrespectively with outer ends of said anchor plate, saidlattercavity plates having preformed cavities therein reg'isterablerespectively with preformed cavities in the eavityplates of said unitdie cast dies, the interlock between said latter center block and cavityplates on said anchor plate consisting of cooperating slots andprojections and.outwardly extending dowellpins on said center'blockprojecting into said cavity plates.

ReferencesCitedin the file of this patent V UNITED STATES PATENTS1,803,300 Fahlman Apr. 28, 1931 2,233,405 Fahlman Mar. 4, 1941 2,261,592Smith Nov. 4, 1941 2,618,823 Perkon Nov. 25, 1952 2,800,685 Gaved July30, 1957

